DEVICE FOR PHASE-FREQUENCY TEST OF AMPLIFIERS Russian patent published in 2013 - IPC G01R27/28 

FIELD: electricity.

SUBSTANCE: method is implemented with levelling and generation of orthogonal output voltages of a controlled phase changer and a controlled attenuator in a wide range of frequencies and their subsequent conversion from a rectangular system of coordinates into a polar one, which makes the process of amplifier rating independent on the value of its phase shift. The device for phase-frequency test of amplifiers includes a block of quadrature signals generation 1, a shaper of rectangular pulses 2, a tested amplifier 3, a controlled phase changer 4, a generator of sawtooth voltage 5, a NOT element 6, a controlled attenuator 7, a device of automatic control of transfer ratio 8, a shaper of pulses of low duration 9, a unit of coordinates conversion 10, an amplitude detector 11, an RS-trigger 12, a comparator 13, the first source of reference voltage 14, a unit of phase detection 15, the second source of reference voltage 16, a summation device 17, a subtraction device 18, a phase indicator 19 and a double-threshold comparator 20.

EFFECT: improved accuracy of amplifier phase-frequency testing.

2 dwg